Extramatrical ectomycorrhizal mycelium contributes one-third of microbial biomass and produces, together with associated roots, half the dissolved organic carbon in a forest soil
Extramatrical ectomycorrhizal mycelium contributes one-third of microbial biomass and produces, together with associated roots, half the dissolved organic carbon in a forest soil
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DOI：
10.1046/j.1469-8137.2002.00417.x
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发表时间：
2002-06-01
期刊：
影响因子：
9.4
通讯作者：
Högberg, P
中科院分区：
文献类型：
--
作者：
Högberg, MN;Högberg, P
采用大面积环剥试验，研究了外生菌根真菌（ECM）菌丝体对土壤微生物生物量的贡献以及ECM根系和真菌对土壤溶解性有机碳（DOC）的贡献。采用熏蒸-萃取技术测定了无根有机土壤中微生物C（C-micr）和微生物N，并对未熏蒸土壤中可萃取DOC进行了测定，结果表明，无根有机土壤中微生物C（C-micr）比对照低41%，而同一时间（即EG后3个月），EG上微生物C（micr）比对照低23%。可提取的DOC是45%，低于环带图比control plots.Our的结果，这是特别感兴趣的，因为它们是直接在外地获得的，清楚地表明了重要的贡献，由extramatical ECM菌丝体的土壤微生物生物量和ECM根的DOC，其他微生物的碳源的生产。(C)新植物学家（2002）154：791-795。
A large-scale tree-girdling experiment enabled estimates in the field of the contribution of extramatrical mycelium of ectomycorrhizal (ECM) fungi to soil microbial biomass and by ECM roots and fungi to production of dissolved organic carbon (DOC).Tree-girdling was made early (EG) or late (LG) during the summer to terminate the flow of photosynthate to roots and ECM fungi. Determination of microbial C (C-micr) and microbial N in root-free organic soil was performed by using the fumigation-extraction technique; extractable DOC was determined on unfumigated soil.Soil C-micr was 41% lower on LG than on control plots I month after LG, whereas at the same time (that is, 3 months after EG), the C(micr)was 23% lower on EG than on control plots. Extractable DOC was 45% lower on girdled plots than control plots.Our results, which are of particular interest as they were obtained directly in the field, clearly demonstrate the important contribution by extramatrical ECM mycelium to soil microbial biomass and by ECM roots to the production of DOC, a carbon source for other microbes. (C) New Phytologist (2002) 154: 791-795.